Lathe



(No Model.)

J. BIRKENHEAD.

LATHE.

No. 272,849. Patented Feb.27,1883.

UNITE STATES v ATENT rtree.;

JOHN BIRKENHEAD, OF MANSFIELD, MASSACHUSETTS.

LATHE.

SPECIFICATION" forming part of Letters Patent No. 272,849, datedFebruary 27, 1883.

Application led October 10, 18H2. (No model.)

To all whom it may concern Be it known thatI, JOHN BIRKENHEAD, ofMansfield, in the county of Bristol, ofthe State of Massachusetts, haveinvented a new and useful Improvement in Lathes 5 and I do herebydeclare the same to be described in the following specification andrepresented iu the accompanying drawings, of which- Figure l is a frontelevation, and Fig. 2 an end view, of a lathe provided with my inveu:tion, thenature of which isdetined in the claims hereinafter set forth.Fig. i5 is a vertical section taken on the line a b of Figi. Fig/1 isI aview ofthe mechanism .applied to the toolcarriage and its feeding-shaftthereof.-

My said invention may be said to be a stopmotion for the tool-carriage,the purpose ofit being mainly to arrest the feeding or lateral movement;ofthe said carriage at any desirable position ofits traverse, asoccasion may require.

In the drawings, A denotes the lathe bed or frame; B C, the puppets; l),the tool-carriage, the latter resting upon the bed or being adapted toit in the usual manner.

E is the feeding-shaft ot' the tool-carriage, such shaft being groovedlengthwise, asshown at c, and supported in bearings d e, so as not onlyto be capable of revolving, but of moving lengthwise of it. in them. inthe bearing thereis applied thereto and to theshaftaspring, j', forretraotin g the shaft.

The driving-shaft ofthe feeding mechanism of the lathe is shown at g.which shaft and the mandrel are provided with sets ofcone-pulleys h andi, about which an endless band is to run to give rotary motion from themandrel. The shaft g is tubular, and is sustained by and revolvesjon ashaft, g', which is fixed to land pro jects from an arm, h. (See Fig.3.) Said arm encompasses and turns upon thebearingd, and is providedwith ears t t" and a screw, lc, the whole being as shown in Fie. 3, soas 'to enable thearm to beturnedon the bearingand clamped thereto,inorder to admit of depression of the shaft g, to el'ect, as occasion mayrequire, the tightening ofthe endless band ofthe cone-pul- 1e \s. Fixedon the shaftg is a pinion, l, that engages with a gear, m, fixed on theshaft E. A housing, n, fastened to the arm h', extends over the gears fmand l.

From the above it will be seen that the rotary motion of the shaft E isoccasioned by the gears l and m when the gear l is putin revolution withand by the shaft g. It will also be seen that on the shaft E being movedto the left far enough in its bearings its gear m Will he thrown out ofengagement with the pinion l, and thereby rotary motion of such shaft Ewill be stopped, in which case the lateral movement of the tool-carriagewill be arrested.

On the shaft E there is arranged concentricallya worm or screw, F, soapplied to saidshaft that it will revolve with and at the same timeslide upon it. The worm is disposed within au oil cup or reservoir, R,the ends of which abut against the ends of the worm, said reservoirbeing secured tothe partp ot the tool-carriage, a ring, G,encompassingthe shaftEand adapted to it, so as to be capable of beingmoved ou itlengthwiseofit, provided with aclamp-screw, q. to tix itinplace on the shaft. Furthermore, there is to the partp a projection, r,which extends backward therefrom in range with the ring G, and thereprojects from the lathe-bed a toothed rack, s,which' engages with apinion, t, suoli pinion beingsupported on a journal, u, sustained by thepart p. The pinion terug-ages with a gear, c, turning on a tixedjournal.On another fixed journal, x, supported by the part p, is a worm-gear, y,that engages with the worm F, and is provided with the spur-gearz.Fulcrumed on the journal is a rockerdever, a', from which a handle, b',extends through a slot, c,in the pat-tp. This levercarries upon journalsc'z d', projecting from it, two gears, e f', either of which, by meansof the lever, can be thrown either out of or into engagement with thegear c. The gear e' engages with the gear z and the gear ff with thegear c', and when either ofthe gears ej" isin engagement with the gear vthe other is outofengagement therewith. While one of the gears e'j" isin engagement with the gear c', the tool-carriage will be movedlaterally in one direction, it being moved in the opposite directionwhen the other of said gears e'f is in engagement with the gearc.

1f. while the tool-carriage is being moved in a direction to the lett,we may desire to stop it, when it tnay attain any position within theextent ofits traverse, we move the ring Gr to the right position on 'theshaft E and clamp such ring to the sh'aft. On the projection r beingcarried by the carriage into contact with the IOO ring, the shaft E willbe moved endwise in its hearings with the carriage until the gear m ismoved out ot' engagement with the gear l. On such dlsengagement ofthesaid two gears l and m taking place, the stoppage ofthe carriageresults.

Un the shaft'u is a crank, w. On turning the lever a so as to throw bothgears e andf out of engagement with the gear e, and afterward revolvingthe crank 10 the right way, the carriage will he moved so asto allow thespring f to retract the shaft E to carry the gear m back into engagementwith the gear l, after which further motion ot' the carriage in the samedirection may be produced by movingthe lever a so as to throw intoengagement with the gear 'v the proper one ofthe two gears ef'. What Iclaim as my invention is as follows, vlz:

1. The combination of the projection r of the tool-carriage, and theadjustable ring G, and its clamping-screw applied to the Worm-shaft, and

with the shaft g of the driving-geert, arr-V ranged and.oper-ating'substantially as and for the purpose set forth.

3. Jointly with the bearing d, the arm h', and the gear-wheels, thehousing n, as and for the purpose set forth.

JOHN vBIRKENHEAD;

Witnesses:

R. H. EDDY, E. B. PRATT.

